You will see this a lot on JBI... but everyone is different. D&F is what allows them to get softer, especially the "F" part because your muscles relax and that (along with any swelling) is why they are so hard. The implants themselves don't change. Your body does.

To answer your question, I think I started seeing a difference after about 5 weeks, and I would say they got softer & softer for about 6 months.